Nut and bolt lock.



Patented Dec. 3|, 190|.

vh E L S E W B. A L 5 3 3 0 9 6 0. N

NUT ANDBOLT LOCK.

(Applicatian led Sept. 16, 1901.)

(lin Model.)

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UNITED STATES PATENT OFFICE.-

JOIIN ALBERT BLACKALL WESLEY, OF GAWLER, SOUTH AUSTRALIA.

NUT AND BOLT LOCK.

SPECIFICATION forming part of Letters Patent No. 690,335, dated December31, 1901.

I Application iiled September 16,1901. Serial No. 75.653.' (No model.)

T0 all whom, t 771,603/ concern:

l Be it known that LJOHN ALBERT BLACKALL IVESLEY, engineer, a subject ofthe King of Great Britain, residing at Gawler,in the State of SouthAustralia, in tbe Commonwealth of Australia, have invented an ImprovedNut and Bolt-Lock,of which the followi ng isa speciiication.

My invention relates to the construction of an improved nut and boltlock. It is more particularly intended for bolting the fishplates to therails in the permanent Way of railways and tramways, but is applicableto all analogous uses where it is of importance that bolts shall beprevented from becoming loose or unscrewed and are subject tointermittent vibration or variations in the strain of their attachments.Its object is to secure the construction of a bolt which shall, inaddition to its locking power as a bolt under tension, sufficientlycombine the inherent character of a spring as to permit of its adaptingitself to any alteration or variation of the tension after it is oncefitted in position without working loose under the vibration caused bythe passage of the rolling-stock or other cause.

The special feature of my invention consists in the construction of abolt in the form or nature of a coiled, bent, or helical spring, whilethe expansion within the nut causes it to be locked and prevents the nutfrom working loose in actual work.

My improved bolt is formed from a strip of spring-steel or othersuitable material of any desired section, preferably having a solid headon one endand a portion of the body screw-threaded in the ordinary way.On the screw-threaded portion is iitted a nut of any usual construction,or equivalent attachment. The bolt when putin position in the sh-jointis tensioned to such a degree that the coils open out and then expand orcontract, according to the variation in the strain upon them from theload or other cause.

That the invention may be clearly understood I have appended hereto asheet of illustrative drawings, in which- Figure lis a diagrammaticalView ot' my improved bolt with the nut removed. Fig. 2 is adiagrammatical view of the bolt under tension; Figs. 3 and 4, detailviews of washer applied to a fish-plate.

In the drawings, A represents the shank of the bolt, in the form of acoiled, bent, or helical spring, with a head B at one end and a loosenut C fitted on the screw-threaded portion D, which uut C when in use isso fitted under tension on the portion D as to hold between it and thehead B the parts, such as the rail and fish-plates, to which the bolt isapplied.

In conjunction with the nut C, I may use a washer D', having projectionsor lugs E to engage in corresponding recesses in the fishplates, andlugs F on its other side to t the squares of the nut, so as to form aiixed bearing for the nut when being secured in position.

In its normal locked position as applied to the fish-plates the bolt isin the form illustrated in Fig. 2. It is itted in position undertension, the nut or other attachment being screwed on or affixed as maybe required. The coils of the bolt are, however, more or less opened outwhen the bolt is screwed up in position and being so opened out andtensioned will readily adapt themselves by expansion or contraction tothe variation in the strain of the rollin g-stock with the variations intemperature or in the load.

The screw-threaded nut also forms a perfeet lock-nut which it ispractically im possible to work loose after being screwed up inposition. The coils forming the body of the bolt expand within the nutand cause the threads to securely lock. The coils may be of any desiredsection, according to the size of bolt employed, and may be coiledeither hand. The bolt itself may also be constructed and tempered in anyWellknown manner which will give the necessary elasticity.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is-

l. A bolt having a shank formed of a coilspring, the coils of the springon one end of said shank threaded, substantially as described.

2. A bolt having a shank of uniform diam.- eter and formed of acoil-spring, the coils of the spring at the end of the bolt threaded toreceive a nut, substantially as described.

3. The combination with a boit; having a one side thereof conforming tothe outline of shank of uniform diameter formed of a, coilthe nut andalug on the opposite side adaptspring, the coils of the spring at theend of ed to take into a recess in the object clamped,

the shank threaded, and a nut, of a Washer l substantially as described.15 5 adaptedlto hold the sides of the nut and a lng In testimony that Iclaim the foregoing :Ls

on its rear face to engage a recess in the 0bmyinvention I have signedmy name in presject clamped, substantially as described. ence of twosubscribing Witnesses.

4. The combination with a bolt having a, JUIIN ALBERT BLACKALL WESLEY.shank formed of a coil-spring, the coils of the Witnesses: 1o spring atthe end of the shank threaded and CHARLES ANDREW MURPHY,

a suitable nur, of a washer having lugs F on l CHARLES STANLEY BURGESS.

